Combination structure of the blade rack and the blade of a ceiling fan

ABSTRACT

A combination structure of the blade rack and the blade of a ceiling includes a blade rack, a blade, multiple adjusting members, and at least one fixing member. The multiple adjusting members are mounted between the blade and the blade rack, so that the included angle between the blade and the blade rack may be adjusted arbitrarily by controlling the number of the multiple adjusting members, so as to adjust the air flow rate by adjusting the relative included angle between the blade and the blade rack.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a combination structure of the blade rack and the blade of a ceiling, and more particularly to a combination structure of the blade rack and the blade of a ceiling, wherein the included angle between the blade and the blade rack may be adjusted arbitrarily by controlling the number of the multiple adjusting members, so as to adjust the air flow rate of the ceiling fan by adjusting the relative included angle between the blade and the blade rack.

[0003] 2. Description of the Related Art

[0004] A conventional combination structure of the blade rack and the blade of a ceiling in accordance with the prior art comprises a single blade rack provided with a single blade. An included angle is defined between the blade rack and the blade.

[0005] As shown in FIG. 5, in the conventional combination structure of the blade rack and the blade of a ceiling in accordance with the prior art, the blade 60 may touch and stir the air by its full area, thereby producing a very large air resistance. In addition, the front end of the blade 60 is provided with an air shearing face 61 that may divide the air flow 63 into an upper air flow 64 and a lower air flow 65. The lower air flow 65 may flow along the air guide face 62 on the bottom of the blade 60. When the blade 60 is rotated, the air will produce a relative reaction which is absorbed by the full-area air guide face 62 of the blade 60, and is transmitted through the blade rack into the motor in the ceiling.

[0006] Thus, the conventional combination structure of the blade rack and the blade of a ceiling in accordance with the prior art has the following disadvantages.

[0007] 1. A determined included angle is defined between the blade rack and the blade, so that the air flow rate can only be controlled by the rotation speed of blade, so that the user cannot adjust the air flow rate or velocity of the ceiling arbitrarily, thereby causing inconvenience in use.

[0008] 2. The air shearing area is extended from the air shearing face 61 to the air guide face 62, so that the blade 60 has a very large air shearing area, thereby easily causing great noise during rotation.

[0009] 3. The air guide face 62 has a very large area, thereby producing a very large air resistance.

[0010] 4. The air resistance is very large, so that it needs a relatively larger power to stir the air flow, thereby consuming energy and increasing the cost of power.

SUMMARY OF THE INVENTION

[0011] The present invention has arisen to mitigate and/or obviate the disadvantage of the conventional combination structure of the blade rack and the blade of a ceiling.

[0012] The primary objective of the present invention is to provide a combination structure of the blade rack and the blade of a ceiling, wherein the included angle between the blade and the blade rack may be adjusted arbitrarily by controlling the number of the multiple adjusting members, so as to adjust the air flow rate of the ceiling fan by adjusting the relative included angle between the blade and the blade rack.

[0013] In accordance with the present invention, there is provided a combination structure of the blade rack and the blade of a ceiling, comprising a blade rack, a blade, multiple adjusting members, and at least one fixing member, wherein:

[0014] the multiple adjusting members are mounted between the blade and the blade rack, so that an included angle between the blade and the blade rack may be adjusted arbitrarily by controlling a number of the multiple adjusting members; and

[0015] the blade is fixed on the blade rack by the at least one fixing member.

[0016] Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017]FIG. 1 is a partially cut-away perspective view of a combination structure of the blade rack and the blade of a ceiling in accordance with a preferred embodiment of the present invention;

[0018]FIG. 2 is an exploded perspective view of the combination structure of the blade rack and the blade of a ceiling as shown in FIG. 1;

[0019]FIG. 3 is a side plan cross-sectional view of the combination structure of the blade rack and the blade of a ceiling as shown in FIG. 1;

[0020]FIG. 4 is a schematic operational view of the combination structure of the blade rack and the blade of a ceiling as shown in FIG. 3; and

[0021]FIG. 5 is a schematic plan view of a conventional combination structure of the blade rack and the blade of a ceiling in accordance with the prior art.

DETAILED DESCRIPTION OF THE INVENTION

[0022] Referring to the drawings and initially to FIGS. 1-3, a combination structure of the blade rack and the blade of a ceiling in accordance with a preferred embodiment of the present invention comprises a blade rack 20, a blade 30, multiple adjusting members 40, and at least one fixing member 50.

[0023] The blade rack 20 has a first end secured on a rotation seat 10 to rotate therewith, and a second end provided with a combination portion 21. The combination portion 21 of the blade rack 20 is an elongated dovetail-shaped channel, and has a top face and a bottom face each provided with an oblique retaining edge 210. The blade rack 20 has a top formed with at least one fixing portion 22 extending into the combination portion 21 of the blade rack 20. Preferably, the fixing portion 22 of the blade rack 20 is a screw bore communicating with the combination portion 21 of the blade rack 20, so that the fixing member 50 may be screwed into the fixing portion 22 of the blade rack 20.

[0024] The blade 30 has a width relatively smaller than half of that of the conventional blade. The blade 30 has one end provided with a combination portion 31 mounted in the combination portion 21 of the blade rack 20. The combination portion 31 of the blade 30 has a tapered shape, and has a top face and a bottom face each provided with an oblique retaining edge 310. The retaining edge 310 of the combination portion 31 of the blade 30 is formed with at least one recessed fixing portion 311 aligning with the fixing portion 22 of the blade rack 20. Thus, the fixing member 50 may be screwed into the fixing portion 22 of the blade rack 20, and may be fixed in the recessed fixing portion 311 of the retaining edge 310 of the combination portion 31 of the blade 30, thereby fixing the blade 30 on the blade rack 20. The retaining edge 310 of the combination portion 31 of the blade 30 is formed with an adjusting slot 40 for receiving the multiple adjusting members 40.

[0025] Each of the multiple adjusting members 40 is a sheet-shaped structure, and is received in the adjusting slot 40 of the retaining edge 310 of the combination portion 31 of the blade 30, and retained by the retaining edge 210 of the combination portion 21 of the blade rack 20.

[0026] The fixing member 50 is a screw that may be screwed into the fixing portion 22 of the blade rack 20 and fixed in the recessed fixing portion 311 of the retaining edge 310 of the combination portion 31 of the blade 30, thereby fixing the blade 30 on the blade rack 20.

[0027] In such a manner, as shown in FIG. 3, the multiple adjusting members 40 may be received in the adjusting slot 312 of the retaining edge 310 of the top face and the bottom face of the combination portion 31 of the blade 30, and retained by the retaining edge 210 of the top face and the bottom face of the combination portion 21 of the blade rack 20.

[0028] Alternatively, as shown in FIG. 4, the multiple adjusting members 40 may be received in the adjusting slot 312 of the retaining edge 310 of the bottom face of the combination portion 31 of the blade 30, and retained by the retaining edge 210 of the bottom face of the combination portion 21 of the blade rack 20.

[0029] Accordingly, in the combination structure of the blade rack and the blade of a ceiling in accordance with the present invention, the multiple adjusting members 40 are mounted between the blade 30 and the blade rack 20. Thus, the included angle between the blade 30 and the blade rack 20 may be arbitrarily adjusted easily and conveniently by controlling the number of the multiple adjusting members 40 in the adjusting slot 40 of the retaining edge 310 of the combination portion 31 of the blade 30.

[0030] In conclusion, the combination structure of the blade rack and the blade of a ceiling in accordance with the present invention has the following advantages.

[0031] 1. The included angle between the blade 30 and the blade rack 20 may be adjusted arbitrarily, so that the combination structure of the blade rack and the blade may produce air flow rates of different strengths by adjusting the relative angles between the blade 30 and the blade rack 20, so as to satisfy different requirements.

[0032] 2. The blade 30 has a width relatively smaller than half of that of the conventional blade, so that the relative cross-sectional area is relatively smaller, and the air shearing area is relatively smaller, thereby reducing the noise due to the air shearing action.

[0033] 3. The blade 30 has a width relatively smaller than half of that of the conventional blade, so that the relative cross-sectional area is relatively smaller, thereby reducing the relative air resistance.

[0034] 4. The relative air resistance is relatively smaller, so that it needs a relatively smaller power to stir the air flow, thereby saving energy and decreasing the cost of power.

[0035] While the preferred embodiment of the present invention has been shown and described, it will be apparent to those skilled in the art that various modifications may be made in the embodiment without departing from the spirit of the present invention. Such modifications are all within the scope of the present invention. 

What is claimed is:
 1. A combination structure of the blade rack and the blade of a ceiling, comprising a blade rack, a blade, multiple adjusting members, and at least one fixing member, wherein: the multiple adjusting members are mounted between the blade and the blade rack, so that an included angle between the blade and the blade rack may be adjusted arbitrarily by controlling a number of the multiple adjusting members; and the blade is fixed on the blade rack by the at least one fixing member.
 2. The combination structure of the blade rack and the blade of a ceiling in accordance with claim 1, wherein the blade rack has one end provided with a combination portion, and the blade has one end provided with a combination portion mounted in the combination portion of the blade rack.
 3. The combination structure of the blade rack and the blade of a ceiling in accordance with claim 2, wherein the combination portion of the blade rack is an elongated dovetail-shaped channel.
 4. The combination structure of the blade rack and the blade of a ceiling in accordance with claim 2, wherein the combination portion of the blade rack has a top -face and a bottom face each provided with an oblique retaining edge.
 5. The combination structure of the blade rack and the blade of a ceiling in accordance with claim 2, wherein the combination portion of the blade has a tapered shape, and has a top face and a bottom face each provided with an oblique retaining edge.
 6. The combination structure of the blade rack and the blade of a ceiling in accordance with claim 5, wherein the blade rack has a top formed with at least one fixing portion extending into the combination portion of the blade rack, the retaining edge of the combination portion of the blade is formed with at least one recessed fixing portion aligning with the fixing portion of the blade rack, and the fixing member is extended through the fixing portion of the blade rack, and is fixed in the recessed fixing portion of the retaining edge of the combination portion of the blade, thereby fixing the blade on the blade rack.
 7. The combination structure of the blade rack and the blade of a ceiling in accordance with claim 5, wherein retaining edge of the combination portion of the blade is formed with an adjusting slot for receiving the multiple adjusting members.
 8. The combination structure of the blade rack and the blade of a ceiling in accordance with claim 7, wherein the multiple adjusting members are received in the adjusting slot of the retaining edge of the combination portion of the blade, and are retained by the retaining edge of the combination portion of the blade rack.
 9. The combination structure of the blade rack and the blade of a ceiling in accordance with claim 1, wherein each of the multiple adjusting members is a sheet-shaped structure.
 10. The combination structure of the blade rack and the blade of a ceiling in accordance with claim 1, wherein the blade has a width relatively smaller than half of that of a conventional blade. 